CN109714079A - Power line carrier communication anti-jamming circuit - Google Patents
Power line carrier communication anti-jamming circuit Download PDFInfo
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Abstract
The present invention provides a kind of power line carrier communication anti-jamming circuit, comprising: one end of resonant component, the resonant component is electrically connected to a power source, and the other end of the resonant component is electrically connected with load；One end of grounded inductor, the grounded inductor is electrically connected with power ground, and the other end of the grounded inductor is electrically connected with load.Compared with prior art, the invention has the following advantages that using near resonance frequency, the impedance of parallel resonance component is all much larger than the principle of inductance impedance itself, harmonic wave is obstructed from harmonic wave source in the form of high impedance, the parameter of change resonant element can be passed through, prevent in harmonic wave caused by power electronic devices harmonic wave identical with carrier communication frequency from diffusing to power grid or being weakened to a certain extent, separate with power grid or bypasses to greatly, so that being not enough to threaten electrical carrier communication, to achieve the purpose that inhibit interference.
Description
Technical field
Present invention design is related to field of power electronics, specifically, being related to the power line carrier communication of power electronic equipment
Anti-jamming circuit.
Background technique
Power carrier is the distinctive communication mode of electric system, and signal is sent on power line and transmits by it.The technology
The Automatic meter reading system, intelligent residential district house system, distribution network automated, internet for being mainly used in water, coal gas, ammeter etc. connect
Enter etc..Due to communicating used frequency generally more than several hundred kHz, 50 hertz of power currents can be avoided
Interference.With small investment, the construction time is short, equipment is simple, communication security, real-time are good, non-relay and communication distance is long etc. one
Number of advantages.It does not need to set up the equipment such as network again, can directly be carried out telecommunication using power grid electric line, as long as that is,
Live wire just can be carried out data transmitting.Therefore, power line carrier communication is the Primary communication of single site network, province's net or even net office net
One of means are the widest communication modes in electric system application region, are the important basic communication means of power telecom network.
However electric system is a complicated huge monster, under power grid there are various inversions, rectification, frequency conversion,
The equipment, the especially power electronic equipment containing devices such as HF switch MOSFET, thyristor, IGBT such as filtering and heavy load,
Such as SVG, APF, photovoltaic DC-to-AC converter.
These power electronic equipments mainly affect power line carrier, PLC in terms of two: on the one hand, these equipment are working
When, electronic power switch pipe works during a high speed opens shutdown, will necessarily generate with switching frequency at double
The harmonic components of number relationship, since the switching frequency of different power electronic equipments is inconsistent, so the harmonic wave generated is even more complexity
Multiplicity, down to several kHz, high then even million grades of frequencies, if not taking effective means and safeguard measure, these are multiple
Miscellaneous harmonic wave directly passes through the defeated network of power transmission and distribution and enters in power grid, since these higher hamonic waves are from several kHz to several hundred kHz
It differs, and China's power line carrier frequencies use scope is 40~500KHZ, carrier frequency band bandwidth is 4KHZ, when frequency is identical
When harmonic components and signal of communication meet, it certainly will weaken and offset mutually, it is also possible to which harmonic signal is mistakened as at signal of communication
Reason, cause data exception etc. as a result, so, after the communication frequency used in us is fixed, inevitably specific
Communication frequency point encounters the harmonic wave interference of same frequency or adjacent frequency, this is significantly impacted just for power line carrier, PLC
Normal data transmission, or even cause not communicating at all；On the other hand, these power electronic equipment output ends often exist larger
Filter capacitor, when equipment connects on power grid, these capacitors, which are equivalent to, directly to be connect on power grid, when the signal of communication of high frequency flows through
When, signal will be filtered directly.
And at present according to transmission channel characteristic interference and abnormal conditions analysis, generally used in power electronics industry with
Lower measure interferes influence to communication to reduce:
1, in the output end string inductance of power electronic equipment, for example the output of certain power electronic equipment is three-phase four-wire system,
Can then connect suitable inductance in triple line and the neutral conductor.This mode is mainly high-frequency resistance characteristic (the Z=2 π for utilizing inductance
FL) weaken the dealing of high-frequency signal between equipment and power grid, to achieve the purpose that inhibit interference.Although this mode can be with
Weaken interference to a certain extent, but theoretically, it is not infinitely great for depending merely on impedance caused by inductance, so inhibiting dry
The ability disturbed is limited, and the fact also turns out that the effect done so is also not highly desirable.Furthermore it is understood that power electronic equipment
Output phase line on generally can all have and hand over big power current, so will inevitably consider inductance when selecting concatenated inductance
Current-carrying capability must increase the manufacturing cost of inductance, and a set of equipment at least uses four inductance, therefore, either in view of suppression
Effect processed also allows for economic benefit, and this mode is all undesirable.
2, filter is connect in equipment output end, this mode can filter the interference signal of part, but can't resolve electricity
Power electronic equipment output capacitance causes the absorption problem of signal since the investment of power electronic equipment is cut out with randomness
The capacitor's capacity being attempted by power grid is uncertain, it is possible that present case can be with normal communication, after other equipment investment
Communication has been arrived with regard to severe jamming, it is not only at high cost using such suppressor mode but also be that can generate to communicate unstable feelings
Condition.
Summary of the invention
For the defects in the prior art, a kind of it is an object of that present invention to provide structures power line simple, easy to maintain
Carrier communication anti-jamming circuit.
In order to solve the above technical problems, the present invention provides a kind of power line carrier communication anti-jamming circuit, comprising: resonance group
One end of part, the resonant component is electrically connected to a power source, and the other end of the resonant component is electrically connected with load；
One end of grounded inductor, the grounded inductor is electrically connected with power ground, the other end of the grounded inductor and load
Ground electrical connection.
It preferably, further include the first filter capacitor, one end of first filter capacitor and one end of the resonant component
Electrical connection, the other end of first filter capacitor are electrically connected with one end of the grounded inductor.
It preferably, further include the second filter capacitor, one end of second filter capacitor is another with the resonant component
End electrical connection, the other end of second filter capacitor are electrically connected with the other end of the grounded inductor.
It preferably, further include the second filter capacitor, one end of second filter capacitor is another with the resonant component
End electrical connection, the other end of second filter capacitor are electrically connected with one end of the grounded inductor.
Preferably, the resonant component includes:
One end of inductance unit, the inductance unit is electrically connected to a power source, the other end and load electricity of the inductance unit
Connection；
One end of capacitor cell, the capacitor cell is electrically connected to a power source, the other end and load electricity of the capacitor cell
Connection.
Preferably, the inductance unit includes multiple resonant inductances in parallel or in series.
Preferably, the capacitor cell includes the resonant capacitance of multiple parallel connections.
Compared with prior art, the invention has the following advantages that using near resonance frequency, the resistance of parallel resonance component
The anti-principle for being all much larger than inductance impedance itself, obstructs harmonic wave from harmonic wave source in the form of high impedance, can be humorous by changing
It shakes the parameter of element, prevents in harmonic wave caused by power electronic devices harmonic wave identical with carrier communication frequency from diffusing to electricity
Net is weakened to a certain extent, is separated with power grid or is bypassed to greatly, leads to so that being not enough to threaten electrical carrier
Letter, to achieve the purpose that inhibit interference.The present invention can inhibit in power line carrier, PLC, influence of the various harmonic waves to communication, protect
Communication quality is demonstrate,proved, it is significant, at low cost, easy to use to have the characteristics that anti-jamming effectiveness, and have certain current-carrying capability, can answer
For large-power occasions.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention
Objects and advantages will become more apparent upon.
Fig. 1 is the impedance of antiresonant circuit and inductance impedance relationship itself near resonance frequency；
Fig. 2 is the position view of the present invention in actual use；
Fig. 3 is hardware circuit diagram one of the present invention；
Fig. 4 is hardware circuit diagram two of the present invention；
Fig. 5 is the first actual connection schematic diagram of the present invention；
Fig. 6 is actual second of connection schematic diagram of the present invention；
Fig. 7 is a kind of deformation connection schematic diagram of multiple present invention in actual use；
Fig. 8 is that the present invention connects multiple equipment schematic diagram；
Fig. 9 is the first connection schematic diagram using only partial circuit of the present invention；
Figure 10 is second of connection schematic diagram using only partial circuit of the present invention；
Figure 11 is the schematic diagram being embedded into the present invention inside power electronic equipment.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several variations can also be made and changed.
The object of the present invention is to provide a kind of power line carrier communication anti-interference equipments based on LC resonance principle.Equipment master
It to be made of LC resonance component, the first filter capacitor C1, the second filter capacitor C2, grounded inductor L.
LC resonance component is mainly made of capacitor cell and inductance unit, theoretically, when capacitor cell and inductance unit are sent out
Infinitely great to the signal impedance of resonance frequency when raw parallel resonance, capacitor cell mainly cooperates inductance unit to generate resonance, inductance
The effect of unit is in addition to occurring resonance with therefore to need to bear certain power frequency electric also as the bridge for connecting equipment and power grid
Stream, there is certain current-carrying capability.
Filter circuit is mainly made of filter capacitor (Y capacitance).Many times ground wire and middle line usually transformer over there
It connects together.And there are common-mode voltage between the middle line and ground wire of device, such common-mode voltage can be made up of ground wire and interfere back
Road, filter capacitor (Y capacitance) are used to filter the interference of common-mode voltage in device side.
Grounded inductor L is mainly used for separating the circuit of signal on ground wire.Anti- stop signal flows into equipment by ground wire and is absorbed
Fall, part can also be prevented not consider net signal, power grid is again introduced by ground wire.
In actual use, each ammeter is connected between three-phase and the neutral conductor respectively, directly passes through transmission and distribution networks and concentration
Device communication, therefore, the neutral conductor and ground wire become the necessary condition for constituting circuit, while also constituting the item in interference signal circuit
Part, as long as therefore weaken or bypass interference signal on the neutral conductor and ground wire, can achieve the purpose that inhibit interference.
Circuit according to the present invention uses near resonance frequency, and the impedance of parallel resonance component is all much larger than inductance sheet
The principle (referring to attached drawing 1) of body impedance obstructs harmonic wave from harmonic wave source in the form of high impedance, can be by changing resonant element
Parameter, prevent in harmonic wave caused by power electronic devices harmonic wave identical with carrier communication frequency from diffusing to power grid or one
Determine to be weakened in degree, separate with power grid or bypass to greatly, is communicated so that being not enough to threaten electrical carrier, thus
Achieve the purpose that inhibit interference.
Compared to both the above mode, the present invention more can thoroughly solve interference problem, and technical difficulty is not high, economical and practical
And effect highly significant.
Resonance frequency setting method:
A) resonance principle
The parallel connection being made of inductance unit (the present embodiment uses inductance L) and capacitor cell (the present embodiment uses capacitor C)
Resonance circuit, circuit admittance Y:
ω0=2 π f0
Wherein,
G is the parasitic conductance of capacitor and inductance；
It is received for the sense of inductance；
ω0C is the receiving of capacitor；
f0For frequency；
I is imaginary number.
When the sinusoidal frequency of resonant component external input voltage reaches a certain specific frequency f0(the i.e. resonance frequency of the circuit
Rate) when, equal, Y=G at this time is received in the admittance and sense of resonant component, and G is very small, by physical knowledge it is recognised thatCircuit impedance R is almost infinitely great at this time, therefore resonant component is externally in off state, at this time as parallel resonance.
The resonance frequency of circuit is also referred to as the intrinsic frequency of circuit.The admittance and sense of circuit are received equal when due to resonance, i.e.,
So resonance angular frequency
Due to ω0=2 π f0, so resonance frequency
It is only determined by circuit parameter inductance L inherently and capacitance C.
B) LC parameter is selected
Assuming that communication frequency is that aHz, resonant inductance L and resonant capacitance C should meet following formula:
Wherein L unit H, C unit are F.
In general, inductance capacitance parameter is not very accurate, so above-mentioned calculating process can only be roughly calculated, in order to more
It accurately is adjusted to resonance point, can be finely adjusted by adjusting patch capacitor on circuit finally can make parameter very accurate.
Under actual conditions, Yao Tigao resonance point impedance, L cannot be too small, and need to minimize inductance and capacitor etc.
Imitate series resistance.The capacitor that capacitor needs to select ESR especially small generally can choose the capacitor of the higher LLC circuit of pressure resistance, or
The Absorption Capacitance of person IGBT.The magnetic core that inductance needs to select high-frequency loss small, such as iron sial or iron silicon magnetic core, preferentially select iron
Silicon magnetic core, because its magnetic conductivity increases the relatively slow of decline with electric current.
In actual use, power grid, interference source device and anti-interference equipment three are as shown in Fig. 2, electrical load equipment
N and power grid N between access anti-interference equipment, meanwhile, anti-interference equipment with load the earth be connected and pass through an inductance connection
To power grid the earth.
System parameter can be configured as needed, and resonance frequency is accurately adjusted to communication frequency, can be subtracted significantly
Bypass and absorption of the small device to communication frequency power carrier signal.
The effect of filter circuit:
Only series LC parallel resonance component can solve carrier signal by device bypass absorption on the output N line of device
The problem of, but can not interference of the solving device to kilowatt meter recorder, still be able to detect bigger interference in ammeter, this says
It is bright that there are also other interference circuits.In fact, many times ground wire and middle line usually connect together in transformer over there.And device
There are common-mode voltage between middle line and ground wire, such common-mode voltage can be made up of interference circuit ground wire, so, in our electricity
The built-in filter capacitor (Y capacitance) of a neutral conductor over the ground in road, when actual use, it is also necessary to be set again in electrical load
Standby ground wire exports upper series inductance.
As shown in Fig. 1~Figure 11, power line carrier communication anti-jamming circuit of the present invention is based on resonance and filtering principle
The filter of circuit includes hardware and the customized mode of connection.
The present invention is individual equipment use, can concentrate multiple present invention and be made into the common anti-interference equipment of multiple equipment,
This is also using design concept of the invention, referring to attached drawing 6.
LC resonance coefficient of the invention can be changed as needed, can satisfy the anti-interference of different communication frequency.Sampling is originally
The invention design circuit whatsoever jamproof design concept of frequency range is the same.
When interfering smaller, in order to reduce cost, resonant component can only be used only, make referring to attached drawing 8, or only
With filter capacitor and grounded inductor L, referring to attached drawing 9.
The not necessarily single independent component of each element that the present invention is told, can be multiple provided as one homogeneous element and passes through string
Mode in parallel is applied in combination, such as resonant capacitance can be multiple capacitors and compose in parallel, and resonant inductance can be multiple inductance
Constitute in parallel or in series etc..These variations do not change design concept of the invention.
In order to facilitate use, external interface of the invention can be made the multichannel interface that can accommodate multiple devices simultaneously,
Even if increasing or reducing number of ports, referring to attached drawing 5.This does not change design concept of the invention yet.
According to actual use situation, the capacitor of resonant component and the pressure voltage of inductance are optional, the value of resonant capacitance and inductance
It is optional, it, in use, will be in the selection higher electricity of current-carrying capacity on large power power electronic appliance as long as meeting resonant parameter
Sense is used as resonant inductance, and circuit designed by the present invention is suitable for the occasion of various different capacities, by changing different rated current
Inductance, can be matched.
The present invention is arranged close to power electronic equipment when in use or may be mounted inside power electronic equipment,
Referring to attached drawing 10, directly interference signal is inhibited to flow into power grid.
When flexible choice input/output interface, capacitor, capacitor installation site need to be installed in power electronic equipment wiring one end
In internal reservation of the present invention.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (7)
1. a kind of power line carrier communication anti-jamming circuit characterized by comprising
One end of resonant component, the resonant component is electrically connected to a power source, and the other end of the resonant component is electrically connected with load；
One end of grounded inductor, the grounded inductor is electrically connected with power ground, the other end and load ground electricity of the grounded inductor
Connection.
2. power line carrier communication anti-jamming circuit according to claim 1, which is characterized in that further include the first filtered electrical
Hold, one end of first filter capacitor is electrically connected with one end of the resonant component, the other end of first filter capacitor
It is electrically connected with one end of the grounded inductor.
3. power line carrier communication anti-jamming circuit according to claim 2, which is characterized in that further include the second filtered electrical
Hold, one end of second filter capacitor is electrically connected with the other end of the resonant component, second filter capacitor it is another
End is electrically connected with the other end of the grounded inductor.
4. power line carrier communication anti-jamming circuit according to claim 2, which is characterized in that further include the second filtered electrical
Hold, one end of second filter capacitor is electrically connected with the other end of the resonant component, second filter capacitor it is another
End is electrically connected with one end of the grounded inductor.
5. power line carrier communication anti-jamming circuit according to claim 1,2,3 or 4, which is characterized in that the resonance
Component includes:
One end of inductance unit, the inductance unit is electrically connected to a power source, and the other end of the inductance unit is electrically connected with load；
One end of capacitor cell, the capacitor cell is electrically connected to a power source, and the other end of the capacitor cell is electrically connected with load.
6. power line carrier communication anti-jamming circuit according to claim 5, which is characterized in that the inductance unit includes
Multiple resonant inductances in parallel or in series.
7. power line carrier communication anti-jamming circuit according to claim 5, which is characterized in that the capacitor cell includes
The resonant capacitance of multiple parallel connections.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910172851.7A CN109714079B (en) | 2019-03-07 | 2019-03-07 | Anti-interference circuit for power line carrier communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910172851.7A CN109714079B (en) | 2019-03-07 | 2019-03-07 | Anti-interference circuit for power line carrier communication |
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| CN109714079B CN109714079B (en) | 2024-01-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112886979A (en) * | 2021-01-19 | 2021-06-01 | 惠州Tcl移动通信有限公司 | CA anti-frequency multiplication interference circuit, radio frequency circuit and communication equipment |
| CN113890565A (en) * | 2021-09-29 | 2022-01-04 | 贵州电网有限责任公司 | Anti-interference device based on low-voltage power line carrier |
| WO2022222149A1 (en) * | 2021-04-23 | 2022-10-27 | 华为数字能源技术有限公司 | Power line communication system, power electronic apparatus and interference suppression method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112886979A (en) * | 2021-01-19 | 2021-06-01 | 惠州Tcl移动通信有限公司 | CA anti-frequency multiplication interference circuit, radio frequency circuit and communication equipment |
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| Publication number | Publication date |
|---|---|
| CN109714079B (en) | 2024-01-30 |
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